Malicious PDF — malware analysis report

Static analysis result for SHA-256 6670f2cad096fc0c…

MALICIOUS

PDF

81.2 KB Created: 2021-03-06 16:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba7f101c39223c5c2bf37d4dde3274ef SHA-1: e9dc9b585356e287d6d2da79d904f6e446de7196 SHA-256: 6670f2cad096fc0cde6eb547c16cea6f05912f15356d1479dab55373d19b6256
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to academic research papers, aligning with the SEO link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/123?utm_term=dise%25C3%25B1os+del+proceso+de+investigacion+cualitativa+sampieri+pdf PDF link annotation
    • http://rixuliketasaban.mywebcommunity.org/13661911215.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/1hfjibY/robotics_stocks_under_5.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/7kjh3zJ/riliwapogalonuwew.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/descargar_juegos_wii_wbfsy1akm.pdfIn PDF document text
    • http://bellissimo.online/zolamadojugegajewosageloj59bwb.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/DiaGhe4/zimowoferezib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_bb8459df9788450abde30f1269132a77.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_cf7e8017026b49c7ab92f7a5fe08dd10.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_cc63d2bb84b24c8b8b781d2bfb13a75d.pdf?index=trueIn PDF document text
    • http://kapowuxivi.atwebpages.com/carson_dellosa_math.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_9babbe1fbe2e47cbbd0f6c13bc8e7455.pdf?index=trueIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/lista_de_habilidades_y_talentos_de_una_persona.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_e6fc31404c97408fbd031f1952702704.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_36871e94d4d14562a63b4407bb962eff.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_70ae167509f041ba9973020e22135721.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_09b845ed29c84326917d5cb23ac42fec.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_85ac34f3929447bdb0555ccda9f0b1d2.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_f41f898267d34dfeab2cdd1b6f0d6928.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_5c5e7731de1d45c386c9db217c0a9189.pdf?index=trueIn PDF document text
    • http://vejegaba.atwebpages.com/what_zodiac_sign_of_april_20_1982.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/serawedekibodudemutokofav.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_4e6d3ab300824ca0b33a9fcab4da9788.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_50d814a8cacb485497eafc607d0984e2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f956.bin
110e603d24055246130a1e7604ea527488af2e1d5d6cb7eb9854ffc9e80b53f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 5748 bytes
font_01_sfnt_off00010c9f.bin
32cf7668d5ffb1ad35fb64b06e17fe30a9c2202cee819b7d9c2dead833f7ff01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 12324 bytes

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